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-rw-r--r--src/libs/libgroff/font.cpp1321
1 files changed, 1321 insertions, 0 deletions
diff --git a/src/libs/libgroff/font.cpp b/src/libs/libgroff/font.cpp
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--- /dev/null
+++ b/src/libs/libgroff/font.cpp
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+/* Copyright (C) 1989-2021 Free Software Foundation, Inc.
+ Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+groff is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "lib.h"
+
+#include <assert.h>
+#include <ctype.h>
+#include <math.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+#include "errarg.h"
+#include "error.h"
+#include "cset.h"
+#include "font.h"
+#include "unicode.h"
+#include "paper.h"
+
+const char *const WS = " \t\n\r";
+
+struct font_char_metric {
+ char type;
+ int code;
+ int width;
+ int height;
+ int depth;
+ int pre_math_space;
+ int italic_correction;
+ int subscript_correction;
+ char *special_device_coding;
+};
+
+struct font_kern_list {
+ glyph *glyph1;
+ glyph *glyph2;
+ int amount;
+ font_kern_list *next;
+
+ font_kern_list(glyph *, glyph *, int, font_kern_list * = 0);
+};
+
+struct font_widths_cache {
+ font_widths_cache *next;
+ int point_size;
+ int *width;
+
+ font_widths_cache(int, int, font_widths_cache * = 0);
+ ~font_widths_cache();
+};
+
+/* text_file */
+
+struct text_file {
+ FILE *fp;
+ char *path;
+ int lineno;
+ int linebufsize;
+ bool recognize_comments;
+ bool silent;
+ char *buf;
+ text_file(FILE *fp, char *p);
+ ~text_file();
+ bool next_line();
+ void error(const char *format,
+ const errarg &arg1 = empty_errarg,
+ const errarg &arg2 = empty_errarg,
+ const errarg &arg3 = empty_errarg);
+ void fatal(const char *format,
+ const errarg &arg1 = empty_errarg,
+ const errarg &arg2 = empty_errarg,
+ const errarg &arg3 = empty_errarg);
+};
+
+text_file::text_file(FILE *p, char *s) : fp(p), path(s), lineno(0),
+ linebufsize(128), recognize_comments(true), silent(false), buf(0)
+{
+}
+
+text_file::~text_file()
+{
+ delete[] buf;
+ free(path);
+ if (fp)
+ fclose(fp);
+}
+
+bool text_file::next_line()
+{
+ if (fp == 0)
+ return false;
+ if (buf == 0)
+ buf = new char[linebufsize];
+ for (;;) {
+ lineno++;
+ int length = 0;
+ for (;;) {
+ int c = getc(fp);
+ if (c == EOF)
+ break;
+ if (is_invalid_input_char(c))
+ error("invalid input character code %1", int(c));
+ else {
+ if (length + 1 >= linebufsize) {
+ char *old_buf = buf;
+ buf = new char[linebufsize * 2];
+ memcpy(buf, old_buf, linebufsize);
+ delete[] old_buf;
+ linebufsize *= 2;
+ }
+ buf[length++] = c;
+ if (c == '\n')
+ break;
+ }
+ }
+ if (length == 0)
+ break;
+ buf[length] = '\0';
+ char *ptr = buf;
+ while (csspace(*ptr))
+ ptr++;
+ if (*ptr != 0 && (!recognize_comments || *ptr != '#'))
+ return true;
+ }
+ return false;
+}
+
+void text_file::error(const char *format,
+ const errarg &arg1,
+ const errarg &arg2,
+ const errarg &arg3)
+{
+ if (!silent)
+ error_with_file_and_line(path, lineno, format, arg1, arg2, arg3);
+}
+
+void text_file::fatal(const char *format,
+ const errarg &arg1,
+ const errarg &arg2,
+ const errarg &arg3)
+{
+ if (!silent)
+ fatal_with_file_and_line(path, lineno, format, arg1, arg2, arg3);
+}
+
+int glyph_to_unicode(glyph *g)
+{
+ const char *nm = glyph_to_name(g);
+ if (nm != 0) {
+ // ASCII character?
+ if (nm[0] == 'c' && nm[1] == 'h' && nm[2] == 'a' && nm[3] == 'r'
+ && (nm[4] >= '0' && nm[4] <= '9')) {
+ int n = (nm[4] - '0');
+ if (nm[5] == '\0')
+ return n;
+ if (n > 0 && (nm[5] >= '0' && nm[5] <= '9')) {
+ n = 10*n + (nm[5] - '0');
+ if (nm[6] == '\0')
+ return n;
+ if (nm[6] >= '0' && nm[6] <= '9') {
+ n = 10*n + (nm[6] - '0');
+ if (nm[7] == '\0' && n < 128)
+ return n;
+ }
+ }
+ }
+ // Unicode character?
+ if (check_unicode_name(nm)) {
+ char *ignore;
+ return (int)strtol(nm + 1, &ignore, 16);
+ }
+ // If 'nm' is a single letter 'x', the glyph name is '\x'.
+ char buf[] = { '\\', '\0', '\0' };
+ if (nm[1] == '\0') {
+ buf[1] = nm[0];
+ nm = buf;
+ }
+ // groff glyphs that map to Unicode?
+ const char *unicode = glyph_name_to_unicode(nm);
+ if (unicode != 0 && strchr(unicode, '_') == 0) {
+ char *ignore;
+ return (int)strtol(unicode, &ignore, 16);
+ }
+ }
+ return -1;
+}
+
+/* font functions */
+
+font::font(const char *s) : ligatures(0), kern_hash_table(0),
+ space_width(0), special(false), internalname(0), slant(0.0), zoom(0),
+ ch_index(0), nindices(0), ch(0), ch_used(0), ch_size(0),
+ widths_cache(0)
+{
+ name = new char[strlen(s) + 1];
+ strcpy(name, s);
+}
+
+font::~font()
+{
+ for (int i = 0; i < ch_used; i++)
+ if (ch[i].special_device_coding)
+ delete[] ch[i].special_device_coding;
+ delete[] ch;
+ delete[] ch_index;
+ if (kern_hash_table) {
+ for (int i = 0; i < KERN_HASH_TABLE_SIZE; i++) {
+ font_kern_list *kerns = kern_hash_table[i];
+ while (kerns) {
+ font_kern_list *tem = kerns;
+ kerns = kerns->next;
+ delete tem;
+ }
+ }
+ delete[] kern_hash_table;
+ }
+ delete[] name;
+ delete[] internalname;
+ while (widths_cache) {
+ font_widths_cache *tem = widths_cache;
+ widths_cache = widths_cache->next;
+ delete tem;
+ }
+}
+
+static int scale_round(int n, int x, int y)
+{
+ assert(x >= 0 && y > 0);
+ int y2 = y/2;
+ if (x == 0)
+ return 0;
+ if (n >= 0) {
+ if (n <= (INT_MAX - y2) / x)
+ return (n * x + y2) / y;
+ return int(n * double(x) / double(y) + .5);
+ }
+ else {
+ if (-(unsigned)n <= (-(unsigned)INT_MIN - y2) / x)
+ return (n * x - y2) / y;
+ return int(n * double(x) / double(y) - .5);
+ }
+}
+
+static int scale_round(int n, int x, int y, int z)
+{
+ assert(x >= 0 && y > 0 && z > 0);
+ if (x == 0)
+ return 0;
+ if (n >= 0)
+ return int((n * double(x) / double(y)) * (double(z) / 1000.0) + .5);
+ else
+ return int((n * double(x) / double(y)) * (double(z) / 1000.0) - .5);
+}
+
+inline int font::scale(int w, int sz)
+{
+ if (zoom)
+ return scale_round(w, sz, unitwidth, zoom);
+ else
+ return sz == unitwidth ? w : scale_round(w, sz, unitwidth);
+}
+
+// Returns whether scaling by arguments was successful. Used for paper
+// size conversions.
+bool font::unit_scale(double *value, char unit)
+{
+ // Paper sizes are handled in inches.
+ double divisor = 0;
+ switch (unit) {
+ case 'i':
+ divisor = 1;
+ break;
+ case 'p':
+ divisor = 72;
+ break;
+ case 'P':
+ divisor = 6;
+ break;
+ case 'c':
+ divisor = 2.54;
+ break;
+ default:
+ assert(0 == "unit not in [cipP]");
+ break;
+ }
+ if (divisor) {
+ *value /= divisor;
+ return true;
+ }
+ return false;
+}
+
+int font::get_skew(glyph *g, int point_size, int sl)
+{
+ int h = get_height(g, point_size);
+ return int(h * tan((slant + sl) * PI / 180.0) + .5);
+}
+
+bool font::contains(glyph *g)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ // Explicitly enumerated glyph?
+ if (idx < nindices && ch_index[idx] >= 0)
+ return true;
+ if (is_unicode) {
+ // Unicode font
+ // ASCII or Unicode character, or groff glyph name that maps to Unicode?
+ if (glyph_to_unicode(g) >= 0)
+ return true;
+ // Numbered character?
+ if (glyph_to_number(g) >= 0)
+ return true;
+ }
+ return false;
+}
+
+bool font::is_special()
+{
+ return special;
+}
+
+font_widths_cache::font_widths_cache(int ps, int ch_size,
+ font_widths_cache *p)
+: next(p), point_size(ps)
+{
+ width = new int[ch_size];
+ for (int i = 0; i < ch_size; i++)
+ width[i] = -1;
+}
+
+font_widths_cache::~font_widths_cache()
+{
+ delete[] width;
+}
+
+int font::get_width(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ int real_size;
+ if (zoom == 0) // 0 means "don't zoom"
+ real_size = point_size;
+ else
+ {
+ if (point_size <= (INT_MAX - 500) / zoom)
+ real_size = (point_size * zoom + 500) / 1000;
+ else
+ real_size = int(point_size * double(zoom) / 1000.0 + .5);
+ }
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ int i = ch_index[idx];
+ if (real_size == unitwidth || font::use_unscaled_charwidths)
+ return ch[i].width;
+
+ if (!widths_cache)
+ widths_cache = new font_widths_cache(real_size, ch_size);
+ else if (widths_cache->point_size != real_size) {
+ font_widths_cache **p;
+ for (p = &widths_cache; *p; p = &(*p)->next)
+ if ((*p)->point_size == real_size)
+ break;
+ if (*p) {
+ font_widths_cache *tem = *p;
+ *p = (*p)->next;
+ tem->next = widths_cache;
+ widths_cache = tem;
+ }
+ else
+ widths_cache = new font_widths_cache(real_size, ch_size,
+ widths_cache);
+ }
+ int &w = widths_cache->width[i];
+ if (w < 0)
+ w = scale(ch[i].width, point_size);
+ return w;
+ }
+ if (is_unicode) {
+ // Unicode font
+ int width = 24; // XXX: Add a request to override this.
+ int w = wcwidth(get_code(g));
+ if (w > 1)
+ width *= w;
+ if (real_size == unitwidth || font::use_unscaled_charwidths)
+ return width;
+ else
+ return scale(width, point_size);
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_height(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return scale(ch[ch_index[idx]].height, point_size);
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_depth(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return scale(ch[ch_index[idx]].depth, point_size);
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_italic_correction(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return scale(ch[ch_index[idx]].italic_correction, point_size);
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_left_italic_correction(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return scale(ch[ch_index[idx]].pre_math_space, point_size);
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_subscript_correction(glyph *g, int point_size)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return scale(ch[ch_index[idx]].subscript_correction, point_size);
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+void font::set_zoom(int factor)
+{
+ assert(factor >= 0);
+ if (factor == 1000)
+ zoom = 0;
+ else
+ zoom = factor;
+}
+
+int font::get_zoom()
+{
+ return zoom;
+}
+
+int font::get_space_width(int point_size)
+{
+ return scale(space_width, point_size);
+}
+
+font_kern_list::font_kern_list(glyph *g1, glyph *g2, int n, font_kern_list *p)
+: glyph1(g1), glyph2(g2), amount(n), next(p)
+{
+}
+
+inline int font::hash_kern(glyph *g1, glyph *g2)
+{
+ int n = ((glyph_to_index(g1) << 10) + glyph_to_index(g2))
+ % KERN_HASH_TABLE_SIZE;
+ return n < 0 ? -n : n;
+}
+
+void font::add_kern(glyph *g1, glyph *g2, int amount)
+{
+ if (!kern_hash_table) {
+ kern_hash_table = new font_kern_list *[int(KERN_HASH_TABLE_SIZE)];
+ for (int i = 0; i < KERN_HASH_TABLE_SIZE; i++)
+ kern_hash_table[i] = 0;
+ }
+ font_kern_list **p = kern_hash_table + hash_kern(g1, g2);
+ *p = new font_kern_list(g1, g2, amount, *p);
+}
+
+int font::get_kern(glyph *g1, glyph *g2, int point_size)
+{
+ if (kern_hash_table) {
+ for (font_kern_list *p = kern_hash_table[hash_kern(g1, g2)]; p;
+ p = p->next)
+ if (g1 == p->glyph1 && g2 == p->glyph2)
+ return scale(p->amount, point_size);
+ }
+ return 0;
+}
+
+bool font::has_ligature(int mask)
+{
+ return (bool) (mask & ligatures);
+}
+
+int font::get_character_type(glyph *g)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return ch[ch_index[idx]].type;
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+int font::get_code(glyph *g)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return ch[ch_index[idx]].code;
+ }
+ if (is_unicode) {
+ // Unicode font
+ // ASCII or Unicode character, or groff glyph name that maps to Unicode?
+ int uni = glyph_to_unicode(g);
+ if (uni >= 0)
+ return uni;
+ // Numbered character?
+ int n = glyph_to_number(g);
+ if (n >= 0)
+ return n;
+ }
+ // The caller must check 'contains(g)' before calling get_code(g).
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+const char *font::get_name()
+{
+ return name;
+}
+
+const char *font::get_internal_name()
+{
+ return internalname;
+}
+
+const char *font::get_special_device_encoding(glyph *g)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx < nindices && ch_index[idx] >= 0) {
+ // Explicitly enumerated glyph
+ return ch[ch_index[idx]].special_device_coding;
+ }
+ if (is_unicode) {
+ // Unicode font
+ return 0;
+ }
+ assert(0 == "glyph is not indexed and device lacks Unicode support");
+ abort(); // -Wreturn-type
+}
+
+const char *font::get_image_generator()
+{
+ return image_generator;
+}
+
+void font::alloc_ch_index(int idx)
+{
+ if (nindices == 0) {
+ nindices = 128;
+ if (idx >= nindices)
+ nindices = idx + 10;
+ ch_index = new int[nindices];
+ for (int i = 0; i < nindices; i++)
+ ch_index[i] = -1;
+ }
+ else {
+ int old_nindices = nindices;
+ nindices *= 2;
+ if (idx >= nindices)
+ nindices = idx + 10;
+ int *old_ch_index = ch_index;
+ ch_index = new int[nindices];
+ memcpy(ch_index, old_ch_index, sizeof(int) * old_nindices);
+ for (int i = old_nindices; i < nindices; i++)
+ ch_index[i] = -1;
+ delete[] old_ch_index;
+ }
+}
+
+void font::extend_ch()
+{
+ if (ch == 0)
+ ch = new font_char_metric[ch_size = 16];
+ else {
+ int old_ch_size = ch_size;
+ ch_size *= 2;
+ font_char_metric *old_ch = ch;
+ ch = new font_char_metric[ch_size];
+ memcpy(ch, old_ch, old_ch_size * sizeof(font_char_metric));
+ delete[] old_ch;
+ }
+}
+
+void font::compact()
+{
+ int i;
+ for (i = nindices - 1; i >= 0; i--)
+ if (ch_index[i] >= 0)
+ break;
+ i++;
+ if (i < nindices) {
+ int *old_ch_index = ch_index;
+ ch_index = new int[i];
+ memcpy(ch_index, old_ch_index, i*sizeof(int));
+ delete[] old_ch_index;
+ nindices = i;
+ }
+ if (ch_used < ch_size) {
+ font_char_metric *old_ch = ch;
+ ch = new font_char_metric[ch_used];
+ memcpy(ch, old_ch, ch_used*sizeof(font_char_metric));
+ delete[] old_ch;
+ ch_size = ch_used;
+ }
+}
+
+void font::add_entry(glyph *g, const font_char_metric &metric)
+{
+ int idx = glyph_to_index(g);
+ assert(idx >= 0);
+ if (idx >= nindices)
+ alloc_ch_index(idx);
+ assert(idx < nindices);
+ if (ch_used + 1 >= ch_size)
+ extend_ch();
+ assert(ch_used + 1 < ch_size);
+ ch_index[idx] = ch_used;
+ ch[ch_used++] = metric;
+}
+
+void font::copy_entry(glyph *new_glyph, glyph *old_glyph)
+{
+ int new_index = glyph_to_index(new_glyph);
+ int old_index = glyph_to_index(old_glyph);
+ assert(new_index >= 0 && old_index >= 0 && old_index < nindices);
+ if (new_index >= nindices)
+ alloc_ch_index(new_index);
+ ch_index[new_index] = ch_index[old_index];
+}
+
+font *font::load_font(const char *s, bool load_header_only)
+{
+ font *f = new font(s);
+ if (!f->load(load_header_only)) {
+ delete f;
+ return 0;
+ }
+ return f;
+}
+
+static char *trim_arg(char *p)
+{
+ if (0 == p)
+ return 0;
+ while (csspace(*p))
+ p++;
+ char *q = strchr(p, '\0');
+ while (q > p && csspace(q[-1]))
+ q--;
+ *q = '\0';
+ return p;
+}
+
+bool font::scan_papersize(const char *p, const char **size,
+ double *length, double *width)
+{
+ double l, w;
+ char lu[2], wu[2];
+ const char *pp = p;
+ bool attempt_file_open = true;
+ char line[255];
+again:
+ if (csdigit(*pp)) {
+ if (sscanf(pp, "%lf%1[ipPc],%lf%1[ipPc]", &l, lu, &w, wu) == 4
+ && l > 0 && w > 0
+ && unit_scale(&l, lu[0]) && unit_scale(&w, wu[0])) {
+ if (length)
+ *length = l;
+ if (width)
+ *width = w;
+ if (size)
+ *size = "custom";
+ return true;
+ }
+ }
+ else {
+ int i;
+ for (i = 0; i < NUM_PAPERSIZES; i++)
+ if (strcasecmp(papersizes[i].name, pp) == 0) {
+ if (length)
+ *length = papersizes[i].length;
+ if (width)
+ *width = papersizes[i].width;
+ if (size)
+ *size = papersizes[i].name;
+ return true;
+ }
+ if (attempt_file_open) {
+ FILE *fp = fopen(p, "r");
+ if (fp != 0) {
+ if (fgets(line, 254, fp)) {
+ // Don't recurse on file names.
+ attempt_file_open = false;
+ char *linep = strchr(line, '\0');
+ // skip final newline, if any
+ if (*(--linep) == '\n')
+ *linep = '\0';
+ pp = line;
+ }
+ fclose(fp);
+ goto again;
+ }
+ }
+ }
+ return false;
+}
+
+bool font::load(bool load_header_only)
+{
+ FILE *fp;
+ char *path;
+ if ((fp = open_file(name, &path)) == 0)
+ return false;
+ text_file t(fp, path);
+ t.silent = load_header_only;
+ char *p = 0;
+ bool saw_name_directive = false;
+ while (t.next_line()) {
+ p = strtok(t.buf, WS);
+ if (strcmp(p, "name") == 0) {
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("'name' directive requires an argument");
+ return false;
+ }
+ if (strcmp(p, name) != 0) {
+ t.error("font description file name '%1' does not match 'name'"
+ " argument '%2'", name, p);
+ return false;
+ }
+ saw_name_directive = true;
+ }
+ else if (strcmp(p, "spacewidth") == 0) {
+ p = strtok(0, WS);
+ int n;
+ if (0 == p) {
+ t.error("missing argument to 'spacewidth' directive");
+ return false;
+ }
+ if (sscanf(p, "%d", &n) != 1) {
+ t.error("invalid argument '%1' to 'spacewidth' directive", p);
+ return false;
+ }
+ if (n <= 0) {
+ t.error("'spacewidth' argument '%1' out of range", n);
+ return false;
+ }
+ space_width = n;
+ }
+ else if (strcmp(p, "slant") == 0) {
+ p = strtok(0, WS);
+ double n;
+ if (0 == p) {
+ t.error("missing argument to 'slant' directive");
+ return false;
+ }
+ if (sscanf(p, "%lf", &n) != 1) {
+ t.error("invalid argument '%1' to 'slant' directive", p);
+ return false;
+ }
+ if (n >= 90.0 || n <= -90.0) {
+ t.error("'slant' directive argument '%1' out of range", n);
+ return false;
+ }
+ slant = n;
+ }
+ else if (strcmp(p, "ligatures") == 0) {
+ for (;;) {
+ p = strtok(0, WS);
+ if (0 == p || strcmp(p, "0") == 0)
+ break;
+ if (strcmp(p, "ff") == 0)
+ ligatures |= LIG_ff;
+ else if (strcmp(p, "fi") == 0)
+ ligatures |= LIG_fi;
+ else if (strcmp(p, "fl") == 0)
+ ligatures |= LIG_fl;
+ else if (strcmp(p, "ffi") == 0)
+ ligatures |= LIG_ffi;
+ else if (strcmp(p, "ffl") == 0)
+ ligatures |= LIG_ffl;
+ else {
+ t.error("unrecognized ligature '%1'", p);
+ return false;
+ }
+ }
+ }
+ else if (strcmp(p, "internalname") == 0) {
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("missing argument to 'internalname' directive");
+ return false;
+ }
+ internalname = new char[strlen(p) + 1];
+ strcpy(internalname, p);
+ }
+ else if (strcmp(p, "special") == 0) {
+ special = true;
+ }
+ else if (strcmp(p, "kernpairs") != 0 && strcmp(p, "charset") != 0) {
+ char *directive = p;
+ p = strtok(0, "\n");
+ handle_unknown_font_command(directive, trim_arg(p), t.path,
+ t.lineno);
+ }
+ else
+ break;
+ }
+ bool saw_charset_directive = false;
+ char *directive = p;
+ t.recognize_comments = false;
+ while (directive) {
+ if (strcmp(directive, "kernpairs") == 0) {
+ if (load_header_only)
+ return true;
+ for (;;) {
+ if (!t.next_line()) {
+ directive = 0;
+ break;
+ }
+ char *c1 = strtok(t.buf, WS);
+ if (0 == c1)
+ continue;
+ char *c2 = strtok(0, WS);
+ if (0 == c2) {
+ directive = c1;
+ break;
+ }
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("missing kern amount for kerning pair '%1 %2'", c1,
+ c2);
+ return false;
+ }
+ int n;
+ if (sscanf(p, "%d", &n) != 1) {
+ t.error("invalid kern amount '%1' for kerning pair '%2 %3'",
+ p, c1, c2);
+ return false;
+ }
+ glyph *g1 = name_to_glyph(c1);
+ glyph *g2 = name_to_glyph(c2);
+ add_kern(g1, g2, n);
+ }
+ }
+ else if (strcmp(directive, "charset") == 0) {
+ if (load_header_only)
+ return true;
+ saw_charset_directive = true;
+ glyph *last_glyph = 0;
+ for (;;) {
+ if (!t.next_line()) {
+ directive = 0;
+ break;
+ }
+ char *nm = strtok(t.buf, WS);
+ assert(nm != 0);
+ p = strtok(0, WS);
+ if (0 == p) {
+ directive = nm;
+ break;
+ }
+ if (p[0] == '"') {
+ if (last_glyph == 0) {
+ t.error("the first entry ('%1') in 'charset' subsection"
+ " cannot be an alias", nm);
+ return false;
+ }
+ if (strcmp(nm, "---") == 0) {
+ t.error("an unnamed character ('---') cannot be an alias");
+ return false;
+ }
+ glyph *g = name_to_glyph(nm);
+ copy_entry(g, last_glyph);
+ }
+ else {
+ font_char_metric metric;
+ metric.height = 0;
+ metric.depth = 0;
+ metric.pre_math_space = 0;
+ metric.italic_correction = 0;
+ metric.subscript_correction = 0;
+ int nparms = sscanf(p, "%d,%d,%d,%d,%d,%d",
+ &metric.width, &metric.height,
+ &metric.depth,
+ &metric.italic_correction,
+ &metric.pre_math_space,
+ &metric.subscript_correction);
+ if (nparms < 1) {
+ t.error("missing or invalid width for glyph '%1'", nm);
+ return false;
+ }
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("missing character type for '%1'", nm);
+ return false;
+ }
+ int type;
+ if (sscanf(p, "%d", &type) != 1) {
+ t.error("invalid character type for '%1'", nm);
+ return false;
+ }
+ if (type < 0 || type > 255) {
+ t.error("character type '%1' out of range for '%2'", type,
+ nm);
+ return false;
+ }
+ metric.type = type;
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("missing code for '%1'", nm);
+ return false;
+ }
+ char *ptr;
+ metric.code = (int)strtol(p, &ptr, 0);
+ if (metric.code == 0 && ptr == p) {
+ t.error("invalid code '%1' for character '%2'", p, nm);
+ return false;
+ }
+ if (is_unicode) {
+ int w = wcwidth(metric.code);
+ if (w > 1)
+ metric.width *= w;
+ }
+ p = strtok(0, WS);
+ if ((0 == p) || (strcmp(p, "--") == 0)) {
+ metric.special_device_coding = 0;
+ }
+ else {
+ char *nam = new char[strlen(p) + 1];
+ strcpy(nam, p);
+ metric.special_device_coding = nam;
+ }
+ if (strcmp(nm, "---") == 0) {
+ last_glyph = number_to_glyph(metric.code);
+ add_entry(last_glyph, metric);
+ }
+ else {
+ last_glyph = name_to_glyph(nm);
+ add_entry(last_glyph, metric);
+ copy_entry(number_to_glyph(metric.code), last_glyph);
+ }
+ }
+ }
+ if (0 == last_glyph) {
+ t.error("no glyphs defined in font description");
+ return false;
+ }
+ }
+ else {
+ t.error("unrecognized font description directive '%1' (missing"
+ " 'kernpairs' or 'charset'?)", directive);
+ return false;
+ }
+ }
+ compact();
+ t.lineno = 0;
+ if (!saw_name_directive) {
+ t.error("font description 'name' directive missing");
+ return false;
+ }
+ if (!is_unicode && !saw_charset_directive) {
+ t.error("font description 'charset' subsection missing");
+ return false;
+ }
+ if (space_width == 0) {
+ t.error("font description 'spacewidth' directive missing");
+ // _Don't_ return false; compute a typical one for Western glyphs.
+ if (zoom)
+ space_width = scale_round(unitwidth, res, 72 * 3 * sizescale,
+ zoom);
+ else
+ space_width = scale_round(unitwidth, res, 72 * 3 * sizescale);
+ }
+ return true;
+}
+
+static struct {
+ const char *numeric_directive;
+ int *ptr;
+} table[] = {
+ { "res", &font::res },
+ { "hor", &font::hor },
+ { "vert", &font::vert },
+ { "unitwidth", &font::unitwidth },
+ { "paperwidth", &font::paperwidth },
+ { "paperlength", &font::paperlength },
+ { "spare1", &font::biggestfont },
+ { "biggestfont", &font::biggestfont },
+ { "spare2", &font::spare2 },
+ { "sizescale", &font::sizescale },
+ };
+
+// Return file specification of DESC file for selected output device if
+// it can be located and is valid, and a null pointer otherwise.
+const char *font::load_desc()
+{
+ int nfonts = 0;
+ FILE *fp;
+ char *path;
+ if ((fp = open_file("DESC", &path)) == 0)
+ return 0 /* nullptr */;
+ text_file t(fp, path);
+ while (t.next_line()) {
+ char *p = strtok(t.buf, WS);
+ assert(p != 0);
+ bool numeric_directive_found = false;
+ unsigned int idx;
+ for (idx = 0; !numeric_directive_found
+ && idx < sizeof(table) / sizeof(table[0]); idx++)
+ if (strcmp(table[idx].numeric_directive, p) == 0)
+ numeric_directive_found = true;
+ if (numeric_directive_found) {
+ char *q = strtok(0, WS);
+ if (0 == q) {
+ t.error("missing value for directive '%1'", p);
+ return 0 /* nullptr */;
+ }
+ int val;
+ if (sscanf(q, "%d", &val) != 1) {
+ t.error("'%1' directive given invalid number '%2'", p, q);
+ return 0 /* nullptr */;
+ }
+ if ((strcmp(p, "res") == 0
+ || strcmp(p, "hor") == 0
+ || strcmp(p, "vert") == 0
+ || strcmp(p, "unitwidth") == 0
+ || strcmp(p, "paperwidth") == 0
+ || strcmp(p, "paperlength") == 0
+ || strcmp(p, "sizescale") == 0)
+ && val < 1) {
+ t.error("expected argument to '%1' directive to be a"
+ " positive number, got '%2'", p, val);
+ return 0 /* nullptr */;
+ }
+ *(table[idx-1].ptr) = val;
+ }
+ else if (strcmp("family", p) == 0) {
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("'family' directive requires an argument");
+ return 0 /* nullptr */;
+ }
+ char *tem = new char[strlen(p)+1];
+ strcpy(tem, p);
+ family = tem;
+ }
+ else if (strcmp("fonts", p) == 0) {
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("'fonts' directive requires arguments");
+ return 0 /* nullptr */;
+ }
+ if (sscanf(p, "%d", &nfonts) != 1 || nfonts <= 0) {
+ t.error("expected first argument to 'fonts' directive to be a"
+ " non-negative number, got '%1'", p);
+ return 0 /* nullptr */;
+ }
+ font_name_table = (const char **)new char *[nfonts+1];
+ for (int i = 0; i < nfonts; i++) {
+ p = strtok(0, WS);
+ while (0 == p) {
+ if (!t.next_line()) {
+ t.error("unexpected end of file while reading font list");
+ return 0 /* nullptr */;
+ }
+ p = strtok(t.buf, WS);
+ }
+ char *temp = new char[strlen(p)+1];
+ strcpy(temp, p);
+ font_name_table[i] = temp;
+ }
+ p = strtok(0, WS);
+ if (p != 0) {
+ t.error("font count does not match declared number of fonts"
+ " ('%1')", nfonts);
+ return 0 /* nullptr */;
+ }
+ font_name_table[nfonts] = 0;
+ }
+ else if (strcmp("papersize", p) == 0) {
+ if (0 == res) {
+ t.error("'res' directive must precede 'papersize' in device"
+ " description file");
+ return 0 /* nullptr */;
+ }
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("'papersize' directive requires an argument");
+ return 0 /* nullptr */;
+ }
+ bool found_paper = false;
+ char *savedp = strdup(p);
+ if (0 == savedp)
+ t.fatal("memory allocation failure while processing 'papersize'"
+ " directive");
+ while (p) {
+ double unscaled_paperwidth, unscaled_paperlength;
+ if (scan_papersize(p, &papersize, &unscaled_paperlength,
+ &unscaled_paperwidth)) {
+ paperwidth = int(unscaled_paperwidth * res + 0.5);
+ paperlength = int(unscaled_paperlength * res + 0.5);
+ found_paper = true;
+ break;
+ }
+ p = strtok(0, WS);
+ }
+ assert(savedp != 0);
+ if (!found_paper) {
+ t.error("unable to determine a paper format from '%1'", savedp);
+ free(savedp);
+ return 0 /* nullptr */;
+ }
+ free(savedp);
+ }
+ else if (strcmp("unscaled_charwidths", p) == 0)
+ use_unscaled_charwidths = true;
+ else if (strcmp("pass_filenames", p) == 0)
+ pass_filenames = true;
+ else if (strcmp("sizes", p) == 0) {
+ int n = 16;
+ sizes = new int[n];
+ int i = 0;
+ for (;;) {
+ p = strtok(0, WS);
+ while (0 == p) {
+ if (!t.next_line()) {
+ t.error("list of sizes must be terminated by '0'");
+ return 0 /* nullptr */;
+ }
+ p = strtok(t.buf, WS);
+ }
+ int lower, upper;
+ switch (sscanf(p, "%d-%d", &lower, &upper)) {
+ case 1:
+ upper = lower;
+ // fall through
+ case 2:
+ if (lower <= upper && lower >= 0)
+ break;
+ // fall through
+ default:
+ t.error("invalid size range '%1'", p);
+ return 0 /* nullptr */;
+ }
+ if (i + 2 > n) {
+ int *old_sizes = sizes;
+ sizes = new int[n*2];
+ memcpy(sizes, old_sizes, n*sizeof(int));
+ n *= 2;
+ delete[] old_sizes;
+ }
+ sizes[i++] = lower;
+ if (lower == 0)
+ break;
+ sizes[i++] = upper;
+ }
+ if (i == 1) {
+ t.error("must have some sizes");
+ return 0 /* nullptr */;
+ }
+ }
+ else if (strcmp("styles", p) == 0) {
+ int style_table_size = 5;
+ style_table = (const char **)new char *[style_table_size];
+ int j;
+ for (j = 0; j < style_table_size; j++)
+ style_table[j] = 0;
+ int i = 0;
+ for (;;) {
+ p = strtok(0, WS);
+ if (0 == p)
+ break;
+ // leave room for terminating 0
+ if (i + 1 >= style_table_size) {
+ const char **old_style_table = style_table;
+ style_table_size *= 2;
+ style_table = (const char **)new char*[style_table_size];
+ for (j = 0; j < i; j++)
+ style_table[j] = old_style_table[j];
+ for (; j < style_table_size; j++)
+ style_table[j] = 0;
+ delete[] old_style_table;
+ }
+ char *tem = new char[strlen(p) + 1];
+ strcpy(tem, p);
+ style_table[i++] = tem;
+ }
+ }
+ else if (strcmp("tcommand", p) == 0)
+ has_tcommand = true;
+ else if (strcmp("use_charnames_in_special", p) == 0)
+ use_charnames_in_special = true;
+ else if (strcmp("unicode", p) == 0)
+ is_unicode = true;
+ else if (strcmp("image_generator", p) == 0) {
+ p = strtok(0, WS);
+ if (0 == p) {
+ t.error("'image_generator' directive requires an argument");
+ return 0 /* nullptr */;
+ }
+ image_generator = strsave(p);
+ }
+ else if (strcmp("charset", p) == 0)
+ break;
+ else if (unknown_desc_command_handler) {
+ char *directive = p;
+ p = strtok(0, "\n");
+ (*unknown_desc_command_handler)(directive, trim_arg(p), t.path,
+ t.lineno);
+ }
+ }
+ t.lineno = 0;
+ if (res == 0) {
+ t.error("device description file missing 'res' directive");
+ return 0 /* nullptr */;
+ }
+ if (unitwidth == 0) {
+ t.error("device description file missing 'unitwidth' directive");
+ return 0 /* nullptr */;
+ }
+ if (font_name_table == 0) {
+ t.error("device description file missing 'fonts' directive");
+ return 0 /* nullptr */;
+ }
+ if (sizes == 0) {
+ t.error("device description file missing 'sizes' directive");
+ return 0 /* nullptr */;
+ }
+ return path;
+}
+
+void font::handle_unknown_font_command(const char *, const char *,
+ const char *, int)
+{
+}
+
+FONT_COMMAND_HANDLER
+font::set_unknown_desc_command_handler(FONT_COMMAND_HANDLER func)
+{
+ FONT_COMMAND_HANDLER prev = unknown_desc_command_handler;
+ unknown_desc_command_handler = func;
+ return prev;
+}
+
+// Local Variables:
+// fill-column: 72
+// mode: C++
+// End:
+// vim: set cindent noexpandtab shiftwidth=2 textwidth=72:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 12:00:53 +0000